Chanjify knowledge library
Understand files.
Choose with confidence.
Clear, practical explanations for image formats, PDF workflows, compression, spreadsheet data, and document publishing—written to help you make better file decisions.
Explore the library
Published guides
Search the guides currently available in the library. New scheduled guides appear here automatically when published.
Electronic Signature vs Digital Signature: What Is the Difference?
An electronic signature is a broad way of indicating approval or intent in an electronic process. A digital signature is a specific cryptographic technique that can provide evidence about…
What Are AcroForm and XFA PDF Forms?
AcroForm and XFA are two different technologies used to create interactive PDF forms. AcroForm is part of the conventional PDF form model and represents fields such as text boxes,…
How to Fill PDF Forms in a Browser
A browser can fill many standard interactive PDF forms without sending the file to a desktop application. The tool reads the PDF, detects supported AcroForm fields, presents values or lets…
How PDF Cropping Works and When You Should Use It
Cropping a PDF usually changes the page area a viewer displays or prints. It does not necessarily delete everything outside that visible rectangle. PDF pages can define several page boxes,…
How to Add a Watermark to PDF Documents
A PDF watermark is visible text or an image placed over or behind page content to communicate status, ownership, branding, or handling instructions. Common examples include "DRAFT,"…
How to Add Page Numbers to a PDF Properly
Adding page numbers to a PDF means drawing number labels onto selected pages in consistent positions. The task sounds simple, but good pagination requires decisions about starting number,…
How to Rotate PDF Pages Without Changing the Content
Rotating a PDF page changes its viewing orientation without requiring the page to be turned into an image. A PDF tool can apply page rotation in 90 degree increments so text, vectors, and…
How to Scan Documents to PDF Using Your Phone Camera
You can create a useful PDF scan with a phone by photographing each paper page clearly, checking focus and perspective, arranging the images in the correct order, and placing them onto PDF…
How to Reorder PDF Pages and Organize a Document
Reordering PDF pages means changing the sequence in which pages appear without rewriting their visible content. A reliable organizer loads the PDF, displays page thumbnails, lets you move…
How to Remove Unwanted Pages From a PDF
Removing pages from a PDF should be a non destructive operation. The safest workflow opens the source, lets you select pages to exclude, creates a new PDF containing the remaining pages,…
Extract PDF Pages vs Split PDF: What Is the Difference?
Extracting PDF pages usually means selecting specific pages from a source and creating a new PDF containing those pages. Splitting a PDF usually means dividing the source into multiple…
How to Split a PDF by Pages or Page Ranges
Splitting a PDF means creating two or more new PDF files from selected pages of an existing document. You can split every page into its own file, divide the document into fixed ranges, or…
How to Merge PDF Files Correctly Without Breaking Page Order
Merging PDFs is technically simple: copy pages from several source documents into one destination document. The difficult part is making sure the files and pages are in the exact sequence…
How PDF Resolution Affects JPG and PNG Output
A PDF page does not usually have one fixed image resolution in the same way a JPG or PNG does. A digitally created PDF can contain vector text, vector shapes, and raster images together.…
JPG vs PNG for PDF Page Export: Which Should You Choose?
Choose PNG when the PDF page contains important text, line art, diagrams, screenshots, or sharp graphics and you want lossless raster output. Choose JPG when the page is dominated by…
How to Convert PDF Pages to Images Without Losing Quality
Converting a PDF page to JPG or PNG requires rasterization. The PDF page is rendered into a fixed pixel grid, so the output can no longer scale indefinitely like vector text and paths…
How to Turn Multiple Images Into One PDF
Turning multiple images into one PDF is more than selecting files and clicking convert. The image order becomes the document's page order, orientation affects readability, page dimensions…
JPG to PDF vs PNG to PDF: Which Is Better?
JPG to PDF is usually better when the source is a photograph and you want a compact document. PNG to PDF is usually better for screenshots, diagrams, text heavy images, and graphics where…
How to Create a PDF from Photos and Images
Creating a PDF from photos or images means placing one or more raster images onto PDF pages and saving them as a document. The simplest workflow is to choose your images, arrange them in…
Raster Images vs Vector Images: Complete Beginner Guide
Raster images are built from pixels. Vector images are built from mathematical descriptions of shapes, paths, curves, fills, and strokes. That single difference explains why photographs are…
How to Reduce Image File Size Without Ruining Quality
The safest way to reduce image file size is to remove data the user does not need before increasing compression. Start with pixel dimensions. Then choose a format suited to the image. After…
Best Image Formats for Website Speed and SEO
There is no single image format that is best for every website asset. AVIF and WebP are strong modern choices for photographic web delivery because they can provide efficient compression.…
Image Resolution vs Dimensions vs DPI: What Is the Difference?
Image dimensions, resolution, PPI, and DPI are often used as if they mean the same thing. They do not. For a raster image, pixel dimensions tell you how many pixels the file contains…
Why Transparent PNG Images Get a Background When Converted to JPG
A transparent PNG gets a solid background when converted to JPG because standard JPEG does not support an alpha channel. PNG can store fully transparent and partially transparent pixels.…
JPG vs PNG: Which Image Format Should You Use?
JPG and PNG are both common raster image formats, but they solve different problems. JPG is usually the better choice for photographs and other continuous tone images when you want a…
WebP vs JPG: Which Format Is Better for Websites?
For many modern websites, WebP is a stronger delivery format than JPG because it can provide efficient compression while also supporting features that traditional JPEG does not, including…
AVIF vs WebP: Which Modern Image Format Is Better?
AVIF and WebP are both modern formats designed to deliver images more efficiently than older web staples in many situations. AVIF can achieve very strong compression and supports advanced…
PNG vs WebP: Quality, Transparency, and File Size Compared
PNG and WebP can both preserve transparency and both can be used without the conventional JPEG style loss of detail, but they are not identical formats. PNG is a mature lossless image…
TIFF vs JPG: Understanding the Difference
TIFF and JPG can both store raster images, but they are commonly used at very different stages of an image workflow. JPG is optimized for convenient distribution and relatively small…
SVG vs PNG: When Should You Use Vector or Raster Images?
SVG and PNG are both excellent web image formats, but they describe graphics in fundamentally different ways. SVG is vector based. It describes shapes, paths, text, and other drawing…
What Is AVIF and Why Is It Becoming Popular?
AVIF is a modern image format built around AV1 image coding and a container from the ISO Base Media File Format family. It is designed to store images efficiently while supporting…
What Is WebP and How Does It Work?
WebP is an image format created for efficient web delivery. It supports lossy compression for photographic imagery, a separate lossless mode, alpha transparency, and animation. That…
Lossy vs Lossless Image Compression Explained
Lossy compression reduces file size by discarding or approximating some source information. Lossless compression reduces file size while allowing the encoded data to be reconstructed…
How Image Transparency Works in PNG, WebP, and SVG
Image transparency allows part of an image to reveal the background underneath it. PNG and WebP handle this in raster images through alpha information associated with pixels. SVG represents…